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How to Determine the Time of Sunrise, and Sunset..., Continued
Example
In our example, we will assume that at 1500 on 1 Sep 94 our training ship
is located at 36° 14.0' N 069° 26' W, on course 090° T at a speed of 10
knots. Problem: find the time of sunset.
OPNAV 3530/38 (4-73)
SUNSET/RISE
DR Lat
Tab Interval
Lat Interval
Lat Diff
Corr Table I
Tab LMT
Corr LMT
DR
l
STD Mer
d
l
(arc)
Step
Action
1.
From the Nautical Almanac
note the time of tab sunset for
the latitude closest to your
current position.
2.
Enter the interval between the
two latitudes closest to your
DR Lat.
3.
Enter the time difference
between the two latitudes.
4.
Enter the difference between
your DR Lat. and the lower tab
latitude.
5.
Go to Correction Table I in the
Nautical Alm., follow the
instructions at the bottom of the
table to determine the time
correction.
6.
7.
8.
9.
10.
Enter the time of the tabulated
lat., use the tab lat that is lower
than your DR Lat.
Add the time correction.
‘Enter the DR Longitude.
Enter the value for the time
zone that the ship is keeping, in
this case +5R express in
degrees, 5 x 15 = 75.
Find the lat difference between
75° and DR
l
069°26'.
Completed Strip Form
DR Lat
36° 14'N
Tab Interval
5°
Lat Interval
5 min
Lat Diff
1°14'
Corr Table I
1 min
Tab LMT
1826
Corr LMT
1827
DR
l
069° 26'
STD Mer
075°
d
l
(arc)
5° 34'
6-8
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